Steamships machinery

Steamships propulsion

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Compound steam engines A steam-engine in which the expansion of the steam from the boiler pressure to the exhaust pressure is carried out in two stages.
Triple steam engines A steam-engine in which the expansion of the steam from the boiler pressure to the exhaust pressure is carried out in three stages.
Quadruple steam engines A steam-engine in which the expansion of the steam from the boiler pressure to the exhaust pressure is carried out in four stages.